Retro Rock and Pop Drum Loops and Samples. Classic Backbeats Plus, a comprehensive collection of grooves and fills that capture the live sounds of an all-maple DW drum kit played in a larger room. If you want ultra-live, retro acoustic drum loops for rock, pop or bluesy-rock (think anything 60’s), then look no further. Classic Backbeats Plus provides thorough coverage of tempos, and a pure, punchy sound that simply makes it a “must have” tool for anyone needing the pure unadulterated tones of an acoustic drum set. The 2-CD Set is 1.3 GB of total live studio drum loops and is divided by tempos.